本文介绍了在Swing中添加ActionEvent的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
类ImageComponent继承JComponent
实现MouseListener,MouseMotionListener {
private final BufferedImage img;
私人点p1,p2;
$ b $ public ImageComponent(File file)throws IOException {
img = ImageIO.read(file);
setPreferredSize(new Dimension(img.getWidth(),img.getHeight()));
addMouseListener(this);
addMouseMotionListener(this);
}
@Override protected void paintComponent(Graphics g){
super.paintComponent(g);
g.drawImage(img,0,0,img.getWidth(),img.getHeight(),this);
if(p1!= null&& p2!= null)
g.drawLine(p1.x,p1.y,p2.x,p2.y);
}
@Override public void mousePressed(MouseEvent e){
p1 = e.getPoint();
}
@Override public void mouseDragged(MouseEvent e){
mouseReleased(e);
}
@Override public void mouseReleased(MouseEvent e){
p2 = e.getPoint();
repaint();
}
@Override public void mouseMoved(MouseEvent e){}
@Override public void mouseClicked(MouseEvent e){}
@Override public void mouseEntered(MouseEvent e){}
@Override public void mouseExited(MouseEvent e){}
public static void main(String [] args)throws Exception {
JFileChooser chooser = new JFileChooser );
chooser.setCurrentDirectory(new File());
chooser.showOpenDialog(new JFrame());
文件文件= chooser.getSelectedFile();
final ImageComponent image = new ImageComponent(file);
JFrame frame = new JFrame(Test);
frame.add(new JScrollPane(image));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,300);
frame.setVisible(true);
$ b $ p
$ b 在这段代码中,它使用 JFileChooser
直接。
现在我想添加一个按钮,当我点击它时,它应该生成一个 ActionEvent
并且应该打开一个 JFileChooser
从中我可以选择一个文件,然后它应该在框架上显示我的图像。我怎样才能做到这一点?
我创建了类似的东西
JButton open_button = new JButton(Add File);
open_button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
try {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory (new File(。));
chooser.showOpenDialog(new JFrame());
File file = chooser.getSelectedFile();
ImageComponent image = new ImageComponent(file);
$ b} catch(IOException ex){
JOptionPane.showMessageDialog(null,IOException Occured);
}
}
但它不工作..
解决方案此答案仅供参考(请参阅原始):
public static void main(String [] args){
final JFrame fram e =新的JFrame(Test);
final ImageComponent imageComponent = new ImageComponent();
$ b frame.add(new JButton(new AbstractAction(Load){
@Override
public void actionPerformed(ActionEvent e){
JFileChooser c = new JFileChooser (new File(。));
if(c.showOpenDialog(frame)== JFileChooser.APPROVE_OPTION){
try {
imageComponent.set(ImageIO.read(c.getSelectedFile ());
} catch(IOException e1){
e1.printStackTrace();
}
}
}
}),BorderLayout。北);
frame.add(new JScrollPane(imageComponent),BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400,300);
frame.setVisible(true);
}
和 ImageComponent
:
static class ImageComponent extends JComponent
实现MouseListener,MouseMotionListener {
BufferedImage img;
Point p1,p2;
public ImageComponent(){
addMouseListener(this); addMouseMotionListener(本);
}
public void set(BufferedImage img){
this.img = img;
setPreferredSize(new Dimension(img.getWidth(),img.getHeight()));
repaint();
}
@Override protected void paintComponent(Graphics g){
super.paintComponent(g);
if(img!= null)
g.drawImage(img,0,0,img.getWidth(),img.getHeight(),this);
if(p1!= null&& p2!= null)
g.drawLine(p1.x,p1.y,p2.x,p2.y);
}
@Override public void mousePressed(MouseEvent e){
p1 = e.getPoint();
}
@Override public void mouseDragged(MouseEvent e){
mouseReleased(e);
}
@Override public void mouseReleased(MouseEvent e){
p2 = e.getPoint();
repaint();
}
@Override public void mouseMoved(MouseEvent e){}
@Override public void mouseClicked(MouseEvent e){}
@Override public void mouseEntered(MouseEvent e){}
@Override public void mouseExited(MouseEvent e){}
}
class ImageComponent extends JComponent
implements MouseListener, MouseMotionListener {
private final BufferedImage img;
private Point p1, p2;
public ImageComponent(File file) throws IOException {
img = ImageIO.read(file);
setPreferredSize(new Dimension(img.getWidth(), img.getHeight()));
addMouseListener(this);
addMouseMotionListener(this);
}
@Override protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), this);
if (p1 != null && p2 != null)
g.drawLine(p1.x, p1.y, p2.x, p2.y);
}
@Override public void mousePressed(MouseEvent e) {
p1 = e.getPoint();
}
@Override public void mouseDragged(MouseEvent e) {
mouseReleased(e);
}
@Override public void mouseReleased(MouseEvent e) {
p2 = e.getPoint();
repaint();
}
@Override public void mouseMoved(MouseEvent e) {}
@Override public void mouseClicked(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
public static void main(String[] args) throws Exception {
JFileChooser chooser=new JFileChooser();
chooser.setCurrentDirectory(new File(" "));
chooser.showOpenDialog(new JFrame());
File file=chooser.getSelectedFile();
final ImageComponent image = new ImageComponent(file);
JFrame frame = new JFrame("Test");
frame.add(new JScrollPane(image));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
}
}
Here in this code, it takes a file using JFileChooser
directly.Now i want to add a button on which when i click, it should generates an ActionEvent
and should open a JFileChooser
from which i can choose a file and then it should show me that image on frame. How can i do that?I Have created something like that
JButton open_button=new JButton("Add File");
open_button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
try {
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
chooser.showOpenDialog(new JFrame());
File file = chooser.getSelectedFile();
ImageComponent image=new ImageComponent(file);
} catch (IOException ex) {
JOptionPane.showMessageDialog(null, "IOException Occured");
}
}
But it isn't working..
解决方案 This answer is just for reference (see the original question/answer):
public static void main(String[] args) {
final JFrame frame = new JFrame("Test");
final ImageComponent imageComponent = new ImageComponent();
frame.add(new JButton(new AbstractAction("Load") {
@Override
public void actionPerformed(ActionEvent e) {
JFileChooser c = new JFileChooser(new File("."));
if (c.showOpenDialog(frame) == JFileChooser.APPROVE_OPTION) {
try {
imageComponent.set(ImageIO.read(c.getSelectedFile()));
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}), BorderLayout.NORTH);
frame.add(new JScrollPane(imageComponent), BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
}
And the ImageComponent
:
static class ImageComponent extends JComponent
implements MouseListener, MouseMotionListener {
BufferedImage img;
Point p1, p2;
public ImageComponent() {
addMouseListener(this); addMouseMotionListener(this);
}
public void set(BufferedImage img) {
this.img = img;
setPreferredSize(new Dimension(img.getWidth(), img.getHeight()));
repaint();
}
@Override protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (img != null)
g.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), this);
if (p1 != null && p2 != null)
g.drawLine(p1.x, p1.y, p2.x, p2.y);
}
@Override public void mousePressed(MouseEvent e) {
p1 = e.getPoint();
}
@Override public void mouseDragged(MouseEvent e) {
mouseReleased(e);
}
@Override public void mouseReleased(MouseEvent e) {
p2 = e.getPoint();
repaint();
}
@Override public void mouseMoved(MouseEvent e) {}
@Override public void mouseClicked(MouseEvent e) {}
@Override public void mouseEntered(MouseEvent e) {}
@Override public void mouseExited(MouseEvent e) {}
}
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